SPCA501_REG_CTLRL
reg_write(gspca_dev, SPCA501_REG_CTLRL, 0x01, 0x02);
reg_write(gspca_dev, SPCA501_REG_CTLRL, 0x01, 0x00);
reg_write(gspca_dev, SPCA501_REG_CTLRL, 0x05, 0x00);